[PATCH] D105970: [flang] Add POSIX implementation for SYSTEM_CLOCK

[Peter Klausler via Phabricator via llvm-commits]

klausler added inline comments.


================
Comment at: flang/runtime/time-intrinsic.cpp:111
+
+constexpr count_t NSECS_PER_SEC = 1'000'000'000;
+
----------------
Please use modern braced initializers in the runtime; they're safer.



================
Comment at: flang/runtime/time-intrinsic.cpp:136
+  // Wrap around to avoid overflows.
+  count_t max_secs = std::numeric_limits<count_t>::max() / NSECS_PER_SEC;
+  count_t wrapped_secs = tspec.tv_sec % max_secs;
----------------
Can be constexpr.

Since `count_t` is a 64-bit signed integer, max_secs is going to be ca. 8e9,  or roughly 300 years.  That might make it hard to test your overflow cases.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105970/new/

https://reviews.llvm.org/D105970